Integral grinding and mixing mortar with integral pestle



Oct. 17, 1950 M. L. CCKOPER INTEGRAL GRINDING ND MIXING MORTAR WITH INTEGRAL PESTLE Filed Sept. 5, 1.946

Patented Oct. 17, 1950 1 :i: I

UNITEDS TATES PATENT OFFICE aszasev This invention relates to mortars and pestles, and specifically toian improved form of integral grinding and mixing mortar; audit also includes an improvedform of-pestle designed, for cooperation with this form of mortar.

One object of this invention is to provide a mortar and mating pestle each with a level or plane bottom, so that all points of the plane bottom of the pestle simultaneously contact with corresponding points of the plane inner bottomsurface of the mortar when the pestle is seated with its bottom surface on the bottom-surface of the mortar, thereby being capable of equally pressing all particles of paste or powder that are between these plane surfaces when such paste or powder is being ground and/or stirred by proper manipulation of the pestle in the mortar.

Another object is to provide the mating mortar and pestle each with a vertical horizontally curved portion that enables them to apply equalized pressure against particles of a pasty or powdry substance when the stirring of the latter causes it to adhere to one or both of these vertical surfaces of the mortar and pestle.

Another object is to provide such mortar and pestle with cooperative level surfaces of such correlated dimensions that insure the lower plane stead of scraping it from the bottom of the mortar.

Another object is to provide the mortar with a narrow upwardly curved margin around said level or plane inner bottom-surface to correspond and cooperate with the upwardly curved margin of the pestle so as to provide grinding cooperation between these upwardly curved surfaces, also to facilitate thorough cleaning of the mortar after each grinding and/or stirring operation.

' romm. onrnomc AND. MIXING ORTAR WITH INTEGRAL PEsrLE Morris L. Cooper; Baltimore, -.Md Application September 5, 1946, Serial No. 694,997.

i'claim. (01. 241-199) Another object is to pestle, with a, portion that is flared and steep, viz., respectively inclined outwardly and inwardly from the respective vertical grinding surfaces, therebyto-prevent proper horizontal ma-.- nipulation of the pestle from lifting the workedon material over the top of the pestle.

Other objects and important features. are pointed out or implied in the following details of description, in connection with the accompanying drawings in which:

Fig. 1 is a to plan view showing the pestle seated upright in the mortar.

Fig. 2 is a vertical sectional view, taken along the line 2--2, of the mortar; the pestle being shown in full elevation at the right, and in broken lines at the left, showing overlap of the pestle at the center of the mortar.

In these views of the invention, similar reference'numerals refer to similar parts as those respectively designated in the following details of description:

The bottom of the mortar hasa normally level inner surface 5 that is plane throughout to the narrow upwardly curved margin 6 which meets with the concave-cylindrical lower wall-portion 1 and also meets with the lower end of the steep upwardly flared upper wall-portion 8 which latter is provided with pouring depression 9. The flared inner wall portion 8 is substantially equal to the inner vertical wall portion 1, thus retaining worked on material against being pressed over the top of the mortar, and due to the flared steep wall portion 8 said material will fall back to the bottom surface 5, to be reground and or remixed.

The pestle I 0 is integrally formed, and comprises an integral unit that includes a normally level lower side II that is plane throughout to a narrow upwardly curved convex margin l 2 which meets the convex vertical surface l3. The handle I4 meets with an upwardly tapered steep intermediate portion IE, or portion that is flared downwardly from the handle M to the convex vertical portion [3.

The mortar and pestle may be made of any appropriate material or materials, according to specific uses to which they may be put; but for general use by pharmacists, physicians etc., the preferred material is Monel metal, stainless provide'each, mortar and a steel or other metal or alloy having similar qualities, viz., weight, wear, and resistance against ill effects of acids etc.

My invention is not confined to the precise form, proportions, dimensions etc., as shown herewith and described in the foregoing, for it is subject to numerous modifications within the scope of the inventive ideas as implied and claimed.

My invention is claimed as follows:

A cooperating hand operated mortar and pestle, a mortar having an annular side wall rising from and surrounding a fiat bottom surface with 19,- rounded corner there'between, said Wall having a cylindrical portion of substantial height defining a substantially cylindrical grinding and mixing chamber having a horizontal top line and being flared and steeply tapered outwardly on the inner surface above the top line of the mixing chamber, and a mating integrally formed. unit pestle having a substan tially cylindrical grinding and mixing head portion of diameter substantially the radius of the chamber, said grinding head having a fiat im-,

perforate end with the edge thereof rounded into the cylindrical outer side on a curve mating the rounded corner of the chamber and with the head of less extent than the height of the Wall of the chamber, and said pestle including a handle portion of less diameter and extend- 3 ing axially from the upper end of the head with a portion intermediate the head and handle portions steeply tapered oppositely to the taper of the upper part of the wall of the chamber,

10 Number 4 V the tapered wall of the chamber being higher than the tapered portion of the pestle.

MORRIS L. COOPER.

5 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date 210,360 Rawlins Nov. 26, 1878 311,580 Hockert Feb. 3, 1885 365,021 Purdy June 14, 1887 15 537,328 White Apr. 9, 1895 745,416 Breakell Dec. 1, 1903 870,087 Dickens Nov. 5, 1907 1,159,206 Garhart Nov. 2, 1915 2,161,988 Chott June 13, 1937 20 2,203,089 Hollenbeck June 4, 1940 FOREIGN PATENTS Number Country Date 370,285 Great Britain Apr. 7, 1932 25 OTHER REFERENCES Page 299 of Laboratory Apparatus Catalogue F, 1906, 2nd Edition, Arthur H. Thomas 00., Philadelphia, Pa. Scientific Library Designation 0 QD 53 T454. (Copy in Division 59,) 

